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From: daveh@cbmvax.cbm.UUCP (Dave Haynie)
Newsgroups: net.micro.amiga
Subject: Re: Vt100 v2.1 warnings
Message-ID: <793@cbmvax.cbmvax.cbm.UUCP>
Date: Fri, 26-Sep-86 12:15:00 EDT
Article-I.D.: cbmvax.793
Posted: Fri Sep 26 12:15:00 1986
Date-Received: Tue, 30-Sep-86 20:33:33 EDT
References: <344@sivax.UUCP>
Organization: Commodore Technology, West Chester, PA
Lines: 50

> 
> Hello,
> 
>    I pulled down the VT100 V2.1 sources and compiled them with Lattice 'C'
> v3.03 after setting VT100.h to LATTICE.
>    It worked ok, but had some questions about some warnings I recieved.
>    In the module Script.c, I recieved 2 warning:
> 
>      Line 427 and 490, Warning 85: Function return value mismatch
> 
>    I am just learning 'C', so it is all new to me.
> 
>    Phil Hunt
>    ..calma!sivax!phil

Lattice incorporates some of the ANSI extensions, and you've just hit upon
one of them, better type checking.  Normal C compilers let you do many
kinds of implicit convertions without telling you about it.  Lattice still
does the conversions, only it warns you about them.  The most common instance
of this I've seen is in functions that look something like:

funct()
{
   ....
   return;
}

Most C compilers won't say anything about this, but technically its wrong.
When you specify "funct()" as above, it defaults to a function returning an
integer.  The return statement, however, isn't returning anything.  Lattice
would be happier with either of the following:

funct()				void funct()
{				{
   ...				   ...
   return 0;			   return;
}				}

The first example explicitly returns a number, the second example explicitly
defines a function that is supposed to have no result.  Note that Lattice
WILL produce working code in all three cases, only that in the first case
it will generate a warning.


-- 
============================================================================
Dave Haynie    {caip,ihnp4,allegra,seismo}!cbmvax!daveh

	These opinions are my own, though if you try them out, and decide
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